Since hiring construction workers to be on the job early Saturday usually means paying them double time (or at least time and a half), that suggests that the contractor is in a big hurry to get the job done before a hard deadline. That could be October, when Apple is rumored to be planning another major announcement — perhaps for the iPad mini, but also possible for a new TV product from Apple.

Apple hasn’t officially acknowledged that this store belongs to it. But many details, including the store’s design, strongly suggest that it is a new Silicon Valley flagship location for the consumer electronics giant. In addition, the store’s location puts it directly adjacent to two of the highest-bandwidth Internet connection points in the Valley: the Palo Alto Internet Exchange (PAIX) and a big AT&T switching facility. The store includes direct connections to both of these facilities, which suggests that it has an unusually high need for fast, low-latency Internet connectivity.

In short, it’s a fantastic location for a showcase of streaming video and Internet TV products.

It’s circumstantial evidence. But it’s another strong suggestion that Apple is planning to unveil a new TV product in October.

The photo above show the storefront as it appears today. Below, planning documents show what the storefront will soon look like.